How do you guys treat empty strings with Oracle? Statement #1: Oracle treats empty string (e.g. '') as NULL in "varchar2" fields. Statement #2: We have a model that defines abstract 'table structure', where for we have fields, that can't be NULL, but can be "empty". This model works with various DBMS; almost everywhere, all is just fine...
Is using a VARCHAR2 (1 BYTE) any less efficient than using CHAR(1 BYTE)? Is using a VARCHAR2 (2000 BYTE) any less efficient than using CHAR(1 BYTE), if I never put any value longer than one character in the field? ** By efficient, I meant efficient in both time (searching) and space (storing). ...
What are the effects of defining a column with VARCHAR2(1000) instead of VARCHAR2(10) in Oracle, when the values are not longer than 10 Byte? Does the column only take the space really necessary to store the values, or would that have any negative impacts on the size/performance of tablespaces/indexes? ...
How to do correct conversion of data from Oracle VARCHAR2 type to MySQL TEXT type? I want insert it into mysql table in field with TEXT type through DBLink. ...
I want to know why Oracle needs the size parameter in the definition of the varchar2. I think that is for constraint. Would it be a better option that oracle takes this parameter as an optional? I often have problems resizing old tables to largers sizes, because sometimes a value is bigger than the size definition of the varchar2 colu...
I have table APP_REQ_APPROVE_COMPARE with following fields: "ID" NUMBER NOT NULL ENABLE, "TRACK_NO" VARCHAR2(20 BYTE) NOT NULL ENABLE, "REQ_DATE" DATE NOT NULL ENABLE, "OFFCODE" CHAR(6 BYTE) NOT NULL ENABLE, "COMPARE_CASE_ID" NUMBER NOT NULL ENABLE, "VEHICLE_NAME" VARCHAR2(100 BYTE), "ENGINE_NO" ...
How can I replace CHAR with VARCHAR2 in all tables in a schema? Note: I'm content with a query that returns the ALTER TABLE statements so I can save the script and run it again. ...
Hi guys I'm using varchar2 for a product name field, but when I query the database from the run SQL command line it shows too many empty spaces, how can I fix this without changing the datatype here is the link to the ss http://img203.imageshack.us/img203/20/varchar.jpg ...
This is related to question: How to store unlimited characters in Oracle 11g? If maximum I need is 8000 characters, can I just add 3 more varchar2 columns so that I will have 4 columns with 2000 char each to get 8000 chars. So when the first column is full, values would be spilled over to the next column and so on. Will this design have...
As everybody working with Oracle knows, it an empty Varchar2 will result in a NULL value when put into a Varchar2 column. I (and a coworker as well) thought we had read about a parameter that could be set in the database to change that behavior and actually differentiate between null values and empty Strings. Is there such a parameter ...
Hi, I've got some help turning my table of the sort: Col 23 25 15 53 ... into something like 23,25,15,53... The query that does it is SELECT max(ltrim(sys_connect_by_path(flow_run_id, ','), ',')) FROM (select flow_run_id, rownum rn from table where CREATED_DATE < sysdate - 32 and flow_id = 3 order by 1 desc) STA...